r u ready to WALK posted:

The esp8266 runs on 3.3v but the nodemcu board has a regulator on it so in theory it should handle 9-10v. The motor isn't strong enough to lift the blind at 5V.
The datasheet for the L293DD says the max input voltage for control is 7V though so 9V for everything was a bad idea.

I think the main problem is that there's no fuse anywhere in the circuit to prevent the magic smoke from escaping

Attempt two has a buck converter set to 5V, maybe this time it won't catch on fire